Keywords drilling accident;directional drilling;directional well;sticking;keyseat;drilling pipe breaking;drilling tool accident;free point;Zhuangxie 18 Well;Zhuangxie 310 Well;Shengli Oilfield;

• 钻井事故;定向钻井;定向井;卡钻;键槽;钻杆断;钻具事故;卡点;胜利油田;桩斜18井;桩斜310井;